• Title/Summary/Keyword: 양기석

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Morphological Diversity of Tremolite-actinolite Series Amphiboles with Implications to the Evaluation of Naturally Occurring Asbestos (투각섬석-양기석 계열 각섬석의 형태적 다양성과 자연 석면 평가에서의 의미)

  • Jeong, Gi-Young;Choi, Jin-Beom
    • Journal of the Mineralogical Society of Korea
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    • v.25 no.2
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    • pp.95-104
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    • 2012

  • Electron microscopy of the tremolite-actinolite series amphiboles from the naturally occurring asbestos locality showed the morphological diversity including fibrous, acicular, and prismatic. Very thin, long, and flexible fibers of constant width form ropy bundles or mats. Acicular particles are slightly thick, long, elastic, and easily separated from the bundle of parallel rods. Acicular fragments of lower aspect ratio are formed during the crushing of the amphibole prism. Morphological features of the amphiboles are different depending on their localities and vary in a specimen. Morphological continuum between amphibole fiber and prism requires the establishment of reliable identification criterions and sample preparation protocol based on the relation between carcinogenicity and morphological features.

  • https://doi.org/10.9727/jmsk.2012.25.2.095 인용 PDF KSCI

Occurrence and Mineralogical Characteristics of Asbestos in Dolostone at Ungdo, Seosan (서산 웅도 백운암 내 석면 산출 및 광물학적 특성 규명)

  • Kim, Seon-Ok;Lee, Minhee;Jung, Hyunjung;Shin, Wonji
    • Economic and Environmental Geology
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    • v.47 no.5
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    • pp.489-496
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    • 2014

  • The occurrence and mineralogical characteristics of asbestos in dolostone at Ungdo, Seosan were investigated by analyses of PLM, XRD, and SEM/EDS. Representative outcrops of dolostone at Ungdo were examined and four dolostone samples were collected according the occurrence type to identify the shape of asbestos in dolostone samples. The host rock of dolostone had been produced from the hydrothermal alteration and/or thermal metamorphism of which main source was assumed as the acidic granite. Tremolites were observed near the cracks or fractures of the dolostone as tamping or gob types. From the mineralogical analyses, main minerals of dolostone were dolomite with calcite, quartz, talc, amphibole, and pyroxene. From SEM/EDS analyses, tremolite-actinolite asbestoses were observed in dolostone and their shapes were prismatic and fibrous (less than $1{\mu}m$ in width). Non-asbestos prismatic forms were also found and they would transfer to asbestos particles resulting from the cleavage and fracture of the prismatic particles. Overall results suggest that asbestoses in Ungdo dolosotnes were mainly tremolite-actinolite and they were originated from the hydrothermal alteration of Ca-Mg rich dolostone.

  • https://doi.org/10.9719/EEG.2014.47.5.489 인용 PDF KSCI

Genetic Differences of Two Asbestos Mines, Boryoung Area (보령지역 두 석면광산의 성인 차이)

  • Song, Suckhwan;Lim, Hoju;Lee, Wooseok
    • Economic and Environmental Geology
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    • v.46 no.2
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    • pp.165-178
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    • 2013

  • This study is for the genetic differences of two closed asbestos mines from Jeongjeon and Ocheon areas in Boryoung, Chungnam. They are mined asbestos for past several decades. Host rocks are serpentinites for Jeongjeon mine and dolomites for Ocheon mine. Asbestos samples and their host rocks are collected from the field trips and examined with microscopes and FESEM, and analysed with XRD and EDX to confirm for the type and/or compositions of the minerals. The asbestos occur as layers, cracks and fractures assummed as a pathway of the hydrothermal water, but show different characteristics. The serpentinites from the Jeongjeon mine contain chrysotile, tremolite and actinolite asbestos. Non-asbestos minerals including tremolite and actinolite were also found. The chrysotiles occur as a cross fiber or slip fiber at veins and along cracks of several mm to cm thickness. Tremolite and actinolite asbestos occur along cracks and fractures of several cm to ten cm thickness. It suggests that the asbestos from Jeongjeon area were formed by the reactions between serpentinite and hydrothermal water. The dolomites of the Ocheon mine only contain tremolite and actinolite asbestos. The asbestos occur along layers, cracks and fractures, suggestive of asbestos from Ocheon area formed by the reactions between dolomite and hydrothermal waters influxed along layers, cracks and fractures. Overall results suggest that two asbestos mines showing different host rocks are located in a Boryoung area. They show a different type of asbestos minerals, reflecting variety of petrogeneses.

  • https://doi.org/10.9719/EEG.2013.46.2.165 인용 PDF KSCI